epoxy

Heat is the enemy of epoxy.
If you don't care about the steel, I'd try heating it up with a propane torch until you see the epoxy starting to soften. Give it some twists and pulls (with the steel in a metal vice) and see if it can be worked loose.

thanks I'll try that

Yep, what splintergroup said. Heat will soften the epoxy heat the shaft with a torch until it will come out.

Even if you care about the steel, heat it up to break the epoxy bond. Give a little time for the heat to travel down the steel into the handle , heat for a min or so , wait a min, heat some more, wait, etc. put the tool end in a vice. Use a strap wrench on the handle, check between heatings if the handle will turn. Wont get hot enough to anneal the steel.